Magento Security Team has recently become aware of increased number of brute-force password guessing attacks on Magento websites. They offered a list of recommended steps to protect your website from such attacks.
However, many of these steps are not implementable by non-tech savvy users, and some of them can even break functionality of Magento features.
At Extensions Mall, we have made an overview of measures recommended by Magento. You can read more in blog post on how to protect Magento from brute-force attacks on our website.
If you are an owner of Magento powered online store, please take time to read it, because we offer more user-friendly, efficient and in the end much more cost-effective solution for keeping your data and data of your customers safe.